hi paul. it is on the fg25st-16 and ive seen it from 500 hrs and up. when your looking at the motor mount the stud that goes through the frame mount on the bottom side the frame mount and the spacer thats installed the holes are elongated allowing the engine to shift back. also on the top stud that bolts onto the engine mount you will find you can undo them with one hand! i will be very surprised if you take a close look at this and have not have any shifted especially in the hour range yours are in
thanks paul.